A compendium of astronomy; containing the elements of the science, familiarly explained and illustrated, with the latest discoveries. Adapted to the use of schools and academies, and of the general reader (1850)
Olmsted, Denison, 1791-1859 · New York, R. B. Collins · leaf 51
enter of the earth. Thus, if the angleAEC (Fig 7,) be found, the radius of the earth AC be-ing known, we have in the right angled triangle AEC,the side AC and all the angles, to find the side CE,which is the distance of the moon from the center oithe earth.* REFRACTION. 68. While parallax depresses… … 67. Why is the determination of the parallax of a heavenlybody an element of great importance ? Illustrate by figure 7. * Should the reader be unacquainted with the principles of trigonom-etry, yet he ought to know the fact that these principles enable us,when we have ascertained certain parts in a…
Astronomy
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